"Your SIM sent a text message"

I'd like to know this as well. Just got this message once after an update. My inclination is to leave it be for now, unless it becomes a problem/nuisance.

Just updated to 8.2 on 6+ and received this message once as well. Not sure what it was.

Same thing, immediately after the update...6, AT&T

I just received the same message as well immediately after the latest update. I'm going to continue in ignorant bliss unless it starts doing it again or becomes a problem.

This happens to every iphone during setup (whether its an update, or an activation). It is basically AT&T verifying the activation. This only happens with AT&T. It is entirely normal.

Same here. AT&T / iPhone 6 - updated to IOS 8.2 and soon after got the dark screen with "your SIM just sent text....".

... according to Apple, SIM is trying to contact carrier update server, happens with AT&T customers after updates, not really anything to worry about.

I'm not concerned so much as I am curious as to why this message is displaying. Have only seen in once (right after the update). Am currently running iOS 8.2. Would like to hear an official response as to what exactly is happening which is causing this message to display.

Same here. What the ****?!?! Apple needs to respond to this NOW...

Same story with me. Brand new iPhone 6, 64gb, bought today. Installing apps now. I have seen that message at least twice. Would like to know why, what it means, and how to stop it.

Just happened here to. iPhone 6 AT&T. only saw the message once so far. ***?? Apple... Hello.... Is anyone listening??

Yes, Working with AT&T.

It's an AT&T Activation Issue - and not an issue with your device itself.

I received the same message seconds after dropping my iPhone 6+. No visual damage done to the phone, as it fell flat on its back and has a case. iOS seems to be running fine except for this message showing up only once so far. I also have not lost connection with my carrier.

My only conclusion is that the phone detects that it has been dropped and generates this message. Where is the SIM sending the text message is my question? Apple?

UPDATE:

So I chose to ignore the message. A couple of days later, while on the road, my phone lost service and came up "no sim card". I called Apple and after the regular reboots and messing with settings nothing would work. They had me pop my sim card slot open before, first time for me. After a few more settings were adjusted I popped it back in and it has been working fine since with no more messages (yet) about the sim card. I haven't synced since then so we'll see if that sim message comes back. If it does, back to Apple for a new sim card.

Same here. Right after I dropped it. No damage though.

JJust got it as well on my AT&T iPhone 6 after upgrading to iOS 8.2.